I bought this mattress 6 months ago - I have back issues so thought that the fact is was orthopedic but medium-firm would be perfect for me. I have been caring for my mum quite a lot at her home during this time so haven’t even regularly slept on the mattress during this time and I agree with the other recent reviewers, it’s already become saggy on my side (I’m petite) and it’s also more soft than medium-firm. I now wish I had changed it over the 100-night trial period but had too much going on. I have since bought the Silentnight  1000 memory pocket mattress to sleep on at my mum’s and it’s AMAZING! I’m having a much more comfortable sleep and I feel like my back pain isn’t as bad. So if you’re looking for an actual medium-firm comfortable mattress I would recommend the Pocket Memory 1000 over the  Eco-comfort pocket sprung 1200